Answer: Six.
Four were born in the United Kingdom — and as you might expect, most of these justices served early in American history. James Wilson and James Iredell were both original justices born in Scotland and England respectively, while William Paterson, born in Northern Ireland, joined the Court in 1793. George Sutherland was also born in 1862 before ultimately settling in Utah.
David Brewer was born in Turkey — technically the Ottoman Empire — in 1837.

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And of course Felix Frankfurter was born in Vienna, Austria — Austria-Hungary to keep the pre-World War I names straight — in 1882.